I have a killswitch mounted on teh door lock switch. . Works twofold, one, puts me in a lower theft % bracket, and two, makes me lock the doors before I start driving. This is especially helpfull with my other vehicles that are also like this, especially when my g/f is driving our Durango, helps me feel a little better knowing that a simple carjacking will fail.
Otherwise, it's doors locked, in gear, wheels turned, and insured.
Merrick